Overview

overview

10

Static

static

a8a5621ce5...a2.exe

windows7_x64

10

a8a5621ce5...a2.exe

windows10_x64

10

Analysis

  • max time kernel
    151s
  • max time network
    136s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    30-03-2021 09:18

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General

  • Target

    a8a5621ce56adb13d5fdfee1709cf03ee839f98c1912ac0055329fc90de2c2a2.exe

  • Size

    124KB

  • MD5

    45e3bef94fdefd78f8e6bcedd5f43715

  • SHA1

    b875676f6eaf9fd3d9105303015b6d60e7c919a8

  • SHA256

    a8a5621ce56adb13d5fdfee1709cf03ee839f98c1912ac0055329fc90de2c2a2

  • SHA512

    15f90b3be77324ca0e7cd1d487fc5b971782facb528c88e55bb63c30d76106fd941a30bbedd07755089b6d55a2852e82c896ff0f7c0a188b59b20c4ee6543e17

Score
10/10
ryukdiscoveryransomware

Malware Config

Extracted

Path

C:\users\Public\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk $password = 'kfXg4XYqb'; $torlink = 'http://piesa6sapybbrz63pqmmwdzyc5fp73b3uya5cpli6pp5jpswndiu44id.onion'; function info(){alert("INSTRUCTION:\r\n1. Download tor browser.\r\n2. Open link through tor browser: " + $torlink + "\r\n3. Fill the form, your password: "+ $password +"\r\nWe will contact you shortly.\r\nAlways send files for test decryption.");};
URLs

http://piesa6sapybbrz63pqmmwdzyc5fp73b3uya5cpli6pp5jpswndiu44id.onion

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

    ransomwareryuk
  • Executes dropped EXE 3 IoCs
  • Loads dropped DLL 16 IoCs
  • Modifies file permissions 1 TTPs 2 IoCs
    discovery
  • Drops desktop.ini file(s) 1 IoCs
  • Enumerates connected drives 3 TTPs 24 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Drops file in Program Files directory 64 IoCs
  • Drops file in Windows directory 13 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Modifies registry class 7 IoCs
  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 25 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a8a5621ce56adb13d5fdfee1709cf03ee839f98c1912ac0055329fc90de2c2a2.exe
    "C:\Users\Admin\AppData\Local\Temp\a8a5621ce56adb13d5fdfee1709cf03ee839f98c1912ac0055329fc90de2c2a2.exe"
    1⤵
    • Loads dropped DLL
    • Drops desktop.ini file(s)
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:384
    • C:\Users\Admin\AppData\Local\Temp\KaKHDxNDPrep.exe
      "C:\Users\Admin\AppData\Local\Temp\KaKHDxNDPrep.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:1088
    • C:\Users\Admin\AppData\Local\Temp\FCwzFwLFYlan.exe
      "C:\Users\Admin\AppData\Local\Temp\FCwzFwLFYlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:316
    • C:\Users\Admin\AppData\Local\Temp\uzekUXRWzlan.exe
      "C:\Users\Admin\AppData\Local\Temp\uzekUXRWzlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:2584
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:2652
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:2664
    • C:\Windows\SysWOW64\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2712
      • C:\Windows\SysWOW64\net1.exe
        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
        3⤵
          PID:2800
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "samss" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:2844
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "samss" /y
          3⤵
            PID:2660
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:2648
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "audioendpointbuilder" /y
            3⤵
              PID:2716
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:1032
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:2940
          • C:\Windows\system32\msiexec.exe
            C:\Windows\system32\msiexec.exe /V
            1⤵
            • Loads dropped DLL
            • Enumerates connected drives
            • Drops file in Windows directory
            • Modifies registry class
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of WriteProcessMemory
            PID:3496
            • C:\Windows\syswow64\MsiExec.exe
              C:\Windows\syswow64\MsiExec.exe -Embedding A551DF57D9D749A4E15C74810E242409
              2⤵
              • Loads dropped DLL
              PID:3096
            • C:\Windows\system32\MsiExec.exe
              C:\Windows\system32\MsiExec.exe -Embedding 99BD120EC1DD471C752964B7C0384EF4
              2⤵
              • Loads dropped DLL
              PID:2860

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          • memory/384-2-0x0000000076241000-0x0000000076243000-memory.dmp

            Filesize

            8KB

            Download

          • memory/3496-83-0x000007FEFB9D1000-0x000007FEFB9D3000-memory.dmp

            Filesize

            8KB

            Download